It's not something that is definitely going to happen, but ER producers are trying to get as many former cast members to make appearances on the show next season, which looks like a go now and will probably be the NBC show's final season.

So...how exactly do you make a dead (really dead, not soap opera/body never found dead) character like Mark Greene come back to life? Executive producer David Zabel says that they've kicked around the idea of airing a so-called "lost episode" from 1996 featuring Edwards and Noah Wyle, who has agreed to come back to the show for several episodes next season. I guess the other choices are flashbacks, Greene's twin brother, or appearing as a ghost.